* {
    margin: 0;
    padding: 0;
    /* disable double_tap zoom on mobile devices */
    -ms-touch-action: manipulation;
    touch-action: manipulation;
    /* strange margin-right occurs when vw<500px */
    overflow-x: hidden;
}

body {
    /* 底部颜色 */
    background-color: rgba(233, 233, 233);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI Adjusted", "Segoe UI", "Liberation Sans", 'Roboto', sans-serif;
    font-size: 1.5em;
    /* 顶部文字颜色 */
    color: #2c5f74;
    /* 禁用右键和选中 */
    -webkit-user-select: none;
    /* Chrome, Safari, Opera */
    -moz-user-select: none;
    /* Firefox */
    -ms-user-select: none;
    /* Internet Explorer/Edge */
    user-select: none;
}


/* 欢迎页面 */
#welcome-page {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(36, 110, 194, 0.8);
    color: rgb(255, 254, 254);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 1;
    transition: opacity 0.5s;
}

#welcome-page img {
    width: 30%;
}






/* 功能区大盒子 */
.buttons-container {
    position: fixed;
    top: 20px;
    left: 20px;
    display: flex;
    align-items: center;
    z-index: 8888;
}





/* 播放按钮 */
.volume-control {
    width: 40px;
    height: 40px;
    background-color: rgba(241, 243, 244, 0.6);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    /* 按钮和右边按钮间隔20px */
    margin-right: 20px;
}

.volume-control:hover {
    background-color: #e5e2e2;
}

.volume-icon {
    width: 24px;
    height: 24px;
    background-image: url("./img/volume_icon.png");
    background-size: cover;
    animation: rotate-icon 5s infinite linear;
}

@keyframes rotate-icon {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}











.wrapper {
    position: relative;
}

#wrapper-background {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: url("img/background.gif");
    background-repeat: no-repeat;
    background-position: 50%;
    background-size: contain;
    z-index: -30;
}

#wrapper-background-filter {
    /* 背景颜色 */
    background-color: rgba(66, 156, 208, 0.9);
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: -20;
}

.preload {
    position: absolute;
    left: 0;
    top: 0;
    visibility: hidden;
}

#content {
    margin: 2vh auto;
    width: 80vw;
}

h1 {
    text-align: center;
    font-size: 3em;
    font-weight: bold;
}

h2 {
    text-align: center;
    font-weight: bold;
    font-size: 1.5em;
}

hr {
    /* 分割线 */
    border-bottom: 6px dashed rgb(227, 226, 223); 
    border-top: none;
    border-left: none;
    border-right: none;
}

#title-container {
    display: flex;
    justify-content: center;
}

#page-title {
    text-align: left;
}


/* logo */
#title-img {
    height: 3.8em;
}

@keyframes shake {
    0% {
      transform: rotate(-5deg);
    }
    50% {
      transform: rotate(5deg);
    }
    100% {
      transform: rotate(-5deg);
    }
  }
  
  .shake {
    animation: shake 1s linear infinite;
  }



#container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 20px;
    margin-bottom: 10px;
    text-align: center;
}

#container select {
    margin: 0 10px;
}

#language-selector,
#mode-selector {
    width: 200px;
    height: 40px;
    /* 选择框颜色 */
    background-color: #dee6eb;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    text-align: center;
    text-align-last: center;
    padding: 10px;
    margin: 0 10px;
    color: rgb(38, 36, 36);
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    cursor: pointer;
    outline: none;
}

#language-selector:hover,
#mode-selector:hover {
    box-shadow: 0 0 10px #dee6eb;
}


#language-selector option {
    text-align: center;
    background-color: #dee6eb;
    color: rgb(118, 114, 114);
}


#subtitle-seperator {
    margin-bottom: 10px;
}

#counter-container {
    text-align: center;
    font-weight: bold;
    margin: 64px 0;
}

#counter-container>p {
    text-shadow: #dee6eb 0 0 10px, #dee6eb 0 0 10px, #dee6eb 0 0 10px, #dee6eb 0 0 10px, #dee6eb 0 0 10px;
}
/* 全球计数器文字颜色 */
#global-counter {
    color: #2d9cd7;   
    font-size: 4em;
    text-shadow:
    -1px -1px 0 black,  
    1px -1px 0 black,
    -1px 1px 0 black,
    1px 1px 0 black; /* 描边效果 */
}
/* 本地计数器文字颜色 */
#local-counter {
    color: #2d9cd7;
    font-size: 1.5em;
}

#counter-button {
    /* 动画触发按钮颜色 */
    background-color: #19457e;
    border: none;
    border-radius: 16px;
    color: rgb(203, 213, 222);
    padding: 16px 32px;
    text-decoration: none;
    font-size: 1em;
    font-family: 'Roboto', sans-serif;
    font-weight: bold;
    margin-top: 16px;

    position: relative;
    overflow: hidden;
    box-shadow: 6px 7px 40px -4px rgba(43, 42, 42, 0.2);
    cursor: pointer;
    transition: background-color 0.1s ease-in-out, scale 0.1s cubic-bezier(0.075, 0.82, 0.165, 1);
}
/* 动画触发按钮的悬挂颜色 */
#counter-button:hover {
    background-color: #10305d;
}

#counter-button:active {
    scale: 0.95;
}

#counter-button span {
    position: absolute;
    border-radius: 50%;
    background-color: #ffffff50;

    width: 100px;
    height: 100px;
    margin-top: -50px;
    margin-left: -50px;

    animation: ripple 1s;
    opacity: 0;
}

@keyframes ripple {
    from {
        opacity: 1;
        transform: scale(0);
    }

    to {
        opacity: 0;
        transform: scale(10);
    }
}

#footer {
    background-color: rgb(253, 250, 244);
    color: black;
    padding: 16px 10vw;
    display: flex;
    gap: 30px;
    align-items: center;
    justify-content: center;
}

/* babara banner 图片样式 */
#babara-card {
    min-width: 256px;
    max-width: 720px;
    height: auto;
    border-top-left-radius: 2% 3.5%;
    border-top-right-radius: 2% 3.5%;
    border-bottom-left-radius: 2% 3.5%;
    border-bottom-right-radius: 2% 3.5%;
}

.footer-icon {
    display: inline-block;
    vertical-align: middle;
    font-size: 2em;
}

#twitter-footer-icon {
    color: #1d9bf0;
}

#github-footer-icon {
    color: #000000;
}

.footer-icon-text {
    display: inline-block;
    vertical-align: middle;
    font-weight: bold;
    margin-left: 6px;
}

/* #footer-repository-text {
    margin-top: 32px;
    margin-bottom: 16px;
} */

@media screen and (max-width: 2240px) {
    .grid-item {
        width: calc(20% - 10px);
    }
}

@media screen and (max-width: 1920px) {
    .grid-item {
        width: calc(25% - 10px);
    }
}

@media screen and (max-width: 1512px) {
    body {
        font-size: 1.25em;
    }

    #subtitle-seperator {
        margin-top: 3px;
        margin-bottom: 11px;
    }
}

@media screen and (max-width: 1280px) {
    .grid-item {
        width: calc(100% / 3 - 10px);
    }

    #footer {
        flex-wrap: wrap;
    }

    #footer-text {
        text-align: center;
    }

    #footer-header-text {
        margin-bottom: 8px;
    }

    #footer-repository-text {
        margin-top: 16px;
        margin-bottom: 8px;
    }
}

@media screen and (max-width: 1265px) {
    body {
        font-size: 1em;
    }

    #subtitle-seperator {
        margin-top: 6px;
        margin-bottom: 12px;
    }
}

@media screen and (max-width: 854px) {
    .grid-item {
        width: calc(20% - 10px);
    }
}

@media screen and (max-width: 510px) {
    h1 {
        font-size: 2.5em;
    }

    h2 {
        font-size: 1.25em;
    }

    #subtitle-seperator {
        margin-top: 8px;
        margin-bottom: 13px;
    }
}

@media screen and (max-width: 500px) {
    .grid-item {
        width: calc(100% - 10px);
    }
}

@media screen and (max-width: 430px) {
    h1 {
        font-size: 2em;
    }

    #subtitle-seperator {
        margin-top: 10px;
    }
}

#access-via-mirror,
#access-via-pages {
    font-size: small;
}